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The objective of this work was to develop a method for environmental zoning of eucalyptus plantations, to identify areas where eucalyptus planting could be developed, and to determine suitability of such areas. The study area was the County of Vassouras, in the State of Rio de Janeiro, considering physical data, environmental legislation, urban areas, and the municipal land use plan. The areas for permanent preservation, as well as the conservation units and areas for industrial expansion, as defined in the county land use plan, plus areas nearby the city were considered restricted for the planting of eucalyptus trees. Vassouras is 552 km² large. Approximately 144 km² are suitable eucalyptus planting, of which 97% are now used for pastures. Approximately 50% of the area suitable for eucalyptus is of average suitability, whereas the class of highest suitability occupies about 30%. The less suitable areas correspond to 20% of the remaining 144 km2.